fix(search): a11y warning on search not expanded

[ariellalgilmore]

Closes https://github.com/carbon-design-system/ibm-products/issues/4766

IBM Equal Access Accessibility Checker - warning on the search icon with role="button" since it's not tabbable

Changelog

Changed

• added a conditional on the aria-label and role for the search icon to only have values when onExpand

Testing / Reviewing

Ran the IBM Equal Access Accessibility checker on the component

Before:

After:

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[carbon-automation[bot]]

Hey there! v11.61.0 was just released that references this issue/PR.